#include <stdio.h>

int main()
{
    int i, j, n = 0, x;
    for (i = 23; n == 0; i += 2)
    {
        for (j = 1, x = i; j <= 4 && x >= 11; j++)
            if ((x + 1) % (j + 1) == 0)
                x -= (x + 1) / (j + 1);
            else
            {
                x = 0;
                break;
            }
        if (j == 5 && x == 11)
        {
            printf("There are %d fishers at first.\n", i);
            n = 1;
        }
    }
}